Bogie construction



Feb. 21, 1939. Hfw. JONKHOFF BQGIE CONSTRUCTION Original Filed Jan. 26, 1933 m YEMnR HENRI M. JE KHO E Relssued Feb. 21, 1939 PATENT OFFICE BOGIE GONS'IRUCTION Henri Wouter Jonkhoii', Arnhem, Netherlands, ai'ssignor to Theodor A. Peter-man, Tacoma,

Original No. 1,930,019, dated October 17, ms. Serial No. 053,735, January 20, ms. Applicatlon mreissue September 27, 19:1, Serial No.

' 7 Claims. This invention relates to improvements in bogie constructions and has for its object to ensure the even distribution oi the weight of the vehicle on a plurality of road wheels, the said wheelsbeing so mounted on the bogie as to be capable oi individual rocking and/or vertical movement, so that each wheel should be able to clear obstructions without any of the other wheels being ailected.

The invention relates more particularly to a,

swivelling bogie having a single bogie axle whereon a plurality oi road wheels are mounted, each wheel being capable oi performing individual rocking and/or vertical movement. 7

With these and other objects in view an embodiment of the invention comprises a bogie having a bogie axle, oppositely directed wheel carrying arms pivotally mounted on said bogle axle, and road wheels mounted on the said wheel carrying arms through the interposition of a parallel linkage suspension.

To insure an 'even distribution of the weight of the vehicle upon the'wheels, the lengths of the wheel carrying arms hear an inverse relationship to the number of wheels mounted thereon. Thus.

where one 01' the arms carries a single wheel and the other twin wheels, the latter is preferably made only half the length the former; but where both arms carry twin wheels the arms are preierablymade equal in length.

According to the illustrated embodiment oi the invention a carrying arm for a single wheel is provided, comprising a trunk and a tailmember hinged together by means of a horizontal pivot. The trunk member is hinged to the bogie axle and the tail member carries the wheel.

The springing of this vehicle may be eflected Y by two quarter elliptical springs mounted on the trunk member oi the carrying arm for the single. wheel, the ends of the quarter elliptical springs bearing upon the ends of the tail member of the carrying arm for the single wheel and the carrying arm for the twin wheels respectively. In a preferred embodiment of the invention the quarter elliptical spring for the carrying 'arm oi the twin wheels is stronger than that for the carrying arm or the single wheel. v

In the accompanying drawing one form of the invention is shown diagrammaticallyby way of example. 3 Figure 1 is a partial plan view oi the improved bogie, the part not shown being exactly similar to that illustrated. Figure2isab'ackviewoi'theparts Flgure1onanenlargedscale.'

g Thebody l of the improvedbogie mayfswivel (c1. sac-124) the single wheel is shown as made up of a trunk member I and a tail member Ia, member I being hinged on the axle I and member Ia being hinged on member I. On the ireejend of tail member la 01' the carrying arm for the single wheel is mounted the road wheel I which is steerable.

There are two road wheels I and I mounted on the free end of the carrying arm I for the twin wheels with the interposition of a parallel link age, which will now be described in detail.

The wheel carrying arm I includes a pivotal mounting tor the parallel linkage shown as comprising an upwardly and downwardly extending stay II secured. thereto in a substantially perpendicular relation. On the top and bottom extremity oi the said stay ,II are plvotally mounted two armed levers ii and II respectively, the arms 01 the said levers I I and I! being the same length. The hub of each 0! the road wheels I and I is provided with an upwardly and downwardly ex-' tending pivot arm II and II, the ends of which are in pivotal engagement with the ends of the twoarmed levers II and II.

Itwillbeseenthatinthiswayaparallellinkage suspension is provided or the twin wheels I andI, by virtue of which these wheels are able to move independently in the vertical direction, so that one of these wheels is able to clear an obstruction lying in its path on the road without the other wheel being aii'ected, Another advan-, tage or this suspension system is that the'vertical movement transmitted to the vehicle proper I ing arm for the twin wheels which results in the weight or the vehicle being evenly distributed on the single wheel and on the twin wheels.

I claim: '1. In a swivelling-bogie, asingle bogie axle, a pair of wheel carrying arms each pivotally mounted at each end of said bogie axle, a single wheel mounted on one of the wheel carrying arms, twin wheels mounted on the other wheel carrying arm, a parallel linkage suspension in serted between the last mentioned wheel carrying arm and the said twin wheels and a spring mounting disposed-on the wheel carrying arm for the single wheel.

2. In a swivelling bogie a single bogie axle, a pair of wheel carrying arms each pivotally mounted at each end of said bogie axle, a single wheel mounted on one of the wheel carrying arms, an upwardly and downwardly extending stay mounted on the free, end of the other wheel carrying arm,--a pair of two armed levers mounted on the stay, a pair of road wheels and means on the hub of said pair of road wheels for the pivotal attachment of thesaid levers thereto.

3. In a swivelling bogie a single bogie axle, a

' wheel carrying arm pivotally mounted on said bogie axle and comprising a trunk member hinged to the bogie axle and a tail member hinged to the trunk member, a I steerable wheel mounted on said tail member, another wheel carrying arm pivotally mounted on the bogie axle, a pair of wheels mounted on the last mentioned wheel carrying arm, and a parallel linkage suspension beaxle, a front wheel mounted on the carrying arm for the single wheel, a pair of wheels mounted on the carrying arm for the pair of wheels and a wheels and their carrying arm, a pair of quarter elliptical springs mounted on said trunk member of the carrying arm for the single wheel,the free end of said quarter elliptical springs bearing on the extremity of said wheel carrying arms respectively.

6. In a bogie construction a bogie axle, wheel carrying arms pivotally mounted thereon, an upwardly and downwardly extending stay mounted on the free end of one of said wheel carrying arms, a pair of two armed levers mounted on the stay with the stay between said levers whereby said levers are vertically spaced with the stay between them, a pair of road wheels, means on the hubs of said road wheels for the pivotal attachment of the said levers thereto, and a wheel mounted on the other of said wheel carrying arms.

7. In a bogie construction a bogie axle, a wheel carrying arm pivotally mounted thereon, an'upwardly and downwardly extending stay mounted on the free end of said wheel carrying arm, apair of two armed levers mounted on the stay with the stay between said levers whereby said levers are vertically spaced with the stay between them, a pairof road wheels, and means on the hubs of said road wheels for the pivotal attachment of the said levers thereto.

. HENRI WOUTER JONKHOFF. 

